使用Digester解析XML文件和JAVA对象的映射

 

package cn.hxex.exam.config;

import java.util.Hashtable;

import cn.hxex.exam.exception.ExamException;

public class ExamConfig ...{
   private Hashtable daos;
   public ExamConfig()...{
       daos=new Hashtable();
   }
   public void addDao(DAOConfig bean)...{
       daos.put(bean.getId(), bean);
   }
   
   public DAOConfig getDAOConfig(String name)...{
       DAOConfig config=(DAOConfig)daos.get(name);
       if(config==null)...{
           throw new ExamException("couldn't find the bean:"+name);
       }
       return config;
   }
}

package cn.hxex.exam.config;

import java.io.InputStream;

import org.apache.commons.digester.Digester;

public class ExamConfigUtil ...{
   public static final String DEFAULT_CONFIG_FILE="ExamConfig.xml";
   public static final ExamConfig MESSAGE_CONFIG;
   
   static...{
       Digester digester=new Digester();
       digester.setValidating(false);
       
       //初始化根配置对象
       digester.addObjectCreate("config", "cn.hxex.exam.config.Examconfig");
       digester.addSetProperties("config");
       
       //初始化DAOConfig对象
       digester.addObjectCreate("config/daos/dao", "cn.hxex.exam.config.DAOConfig");
       digester.addSetProperties("config/daos/dao");
       digester.addSetNext("config/dao/dao", "addDao","cn.hxex.exam.config.DAOConfig");
       
       //读取配置文件
       ClassLoader classLoader=Thread.currentThread().getContextClassLoader();
       InputStream in=classLoader.getResourceAsStream(DEFAULT_CONFIG_FILE);
       ExamConfig config=null;
       try ...{
          if(in!=null)...{
              config=(ExamConfig)digester.parse(in);
          }
        } catch (Exception e) ...{
          e.printStackTrace();
       }
        MESSAGE_CONFIG=config;    
   }
   
   public static ExamConfig getConfig()...{
       return ExamConfigUtil.MESSAGE_CONFIG;
   }
   
   public static DAOConfig getDAOConfig(String name)...{
       return MESSAGE_CONFIG.getDAOConfig(name);
   }
   
}

<config>
    <daos>
        <dao id="UserDAO" type="cn.hxex.exam.dao.hibernate.UserDAOHibernate" />
        <dao id="TeacherDAO" type="cn.hxex.exam.dao.hibernate.TeacherDAOHibernate" />
        <dao id="TestPaperDAO" type="cn.hxex.exam.dao.hibernate.TestPaperDAOHibernate" />
        <dao id="RoleDAO" type="cn.hxex.exam.dao.hibernate.RoleDAOHibernate" />
        <dao id="ClassesDAO" type="cn.hxex.exam.dao.hibernate.ClassesDAOHibernate" />
        <dao id="StudentDAO" type="cn.hxex.exam.dao.hibernate.StudentDAOHibernate" />
        <dao id="SelectQuestionDAO" type="cn.hxex.exam.dao.hibernate.SelectQuestionDAOHibernate" />
        <dao id="YesNoQuestionDAO" type="cn.hxex.exam.dao.hibernate.YesNoQuestionDAOHibernate" />
    </daos>
    <cache type="cn.hxex.exam.cache.ehcache.EHCache">
        <property name="cachename" value="cache" />
    </cache>
    <sysconfig>
        <property name="superuser" value="super,test" />
    </sysconfig>
</config>